O'Connell
> Sent: Thursday, October 11, 2007 11:21 AM
> To: emc-p...@ieee.org
> Subject: RE: Class II PSU for IT power systems
>
>
> Mr. Nute,
>
> Would your assertion apply to both Class I and Class II construction ?
>
> I am certain that you can see where I a
n Gies
> Sent: Thursday, October 11, 2007 4:51 PM
> To: EMC-PSTC@LISTSERV.IEEE.ORG
> Subject: RE: Class II PSU for IT power systems
>
> Kris,
>
> If you have an electronic copy of the standard, do a search
> on "IT" and
> determine if the clause is applicable.
5 oktober 2007 15:50
To: emc-p...@ieee.org
Subject: RE: Class II PSU for IT power systems
If I am not missing something obvious, the construction answers the
question.
Class II construction does not have to depend on a protective earth for
protection against shock, so there is no need for the g
i...@ieee.org
Cc: emc-p...@ieee.org
Subject: Re: Class II PSU for IT power systems
Rich,
My view is a product for an IT power system should have its mains insulation
selected based on the phase to phase voltage of the supply.
While most designs are based on normal, not fault conditions for the
correct ?
luck,
Brian
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of
rn...@san.rr.com
Sent: Thursday, October 11, 2007 10:43 AM
To: 'Robert Johnson'
Cc: emc-p...@ieee.org
Subject: RE: Class II PSU for IT power systems
Hi Bob:
Thanks for your thoughtful response.
You
discussion?
Best regards,
Richard Nute
Product Safety Consultant
San Diego
From: Robert Johnson [mailto:john...@itesafety.com]
Sent: Monday, October 08, 2007 10:48 PM
To: ri...@ieee.org
Cc: emc-p...@ieee.org
Subject: Re: Class II PSU for IT power systems
Rich,
My view is a
ect: Re: Class II PSU for IT power systems
It helps to think about the differences and reasons for an IT system.
A normal power distribution system is earthed at its point of origination (e.g
transformer or generator) to limit the voltage difference between earth and
points in the system.
For exampl
emc-p...@ieee.org] On Behalf Of Robert Johnson
Sent: Saturday, October 06, 2007 2:27 PM
To: owner-emc-p...@listserv.ieee.org
Cc: emc-p...@ieee.org
Subject: Re: Class II PSU for IT power systems
It helps to think about the differences and reasons for an IT system.
A normal power distribution syst
It helps to think about the differences and reasons for an IT system.
A normal power distribution system is earthed at its point of origination (e.g
transformer or generator) to limit the voltage difference between earth and
points in the system.
For example you may have a single phase 120/240v wit
-p...@ieee.org
Subject: RE: Class II PSU for IT power systems
If I am not missing something obvious, the construction answers the
question.
Class II construction does not have to depend on a protective earth for
protection against shock, so there is no need for the ground pin.
Perhaps we have
If I am not missing something obvious, the construction answers the
question.
Class II construction does not have to depend on a protective earth for
protection against shock, so there is no need for the ground pin.
Perhaps we have a 'terminology disconnect' - are you referring to an "IT
power di
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